/* This is supposed to be a "real" DFU implementation, just as specified in the
 * USB DFU 1.0 Spec.  Not overloaded like the Atmel one...
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <usb.h>

#include "dfu.h"
#include "usb_dfu.h"
#include "abstractfile.h"

/* ugly hack for Win32 */
#ifndef O_BINARY
#define O_BINARY 0
#endif

/*
 *  * CRC32 code ripped off (and adapted) from the zlib-1.1.3 distribution by Jean-loup Gailly and Mark Adler.
 *   *
 *    * Copyright (C) 1995-1998 Mark Adler
 *     * For conditions of distribution and use, see copyright notice in zlib.h
 *      *
 *       */

/* ========================================================================
 *  * Table of CRC-32's of all single-byte values (made by make_crc_table)
 *   */
static uint32_t crc_table[256] = {
  0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
  0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
  0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
  0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
  0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
  0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
  0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
  0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
  0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
  0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
  0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
  0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
  0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
  0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
  0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
  0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
  0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
  0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
  0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
  0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
  0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
  0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
  0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
  0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
  0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
  0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
  0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
  0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
  0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
  0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
  0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
  0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
  0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
  0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
  0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
  0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
  0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
  0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
  0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
  0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
  0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
  0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
  0x68ddb3f8l, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
  0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
  0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
  0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
  0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
  0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
  0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
  0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
  0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
  0x2d02ef8dL
};

/* ========================================================================= */
#define DO1(buf) crc = crc_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
#define DO2(buf)  DO1(buf); DO1(buf);
#define DO4(buf)  DO2(buf); DO2(buf);
#define DO8(buf)  DO4(buf); DO4(buf);

/* ========================================================================= */
uint32_t AppleCRC32Checksum(uint32_t* ckSum, const char *buf, size_t len)
{
  uint32_t crc;
  
  crc = *ckSum;
  
  if (buf == NULL) return crc;
  
  while (len >= 8)
  {
    DO8(buf);
    len -= 8;
  }
  if (len)
  {
    do {
DO1(buf);
    } while (--len);
  }

  *ckSum = crc;
  return crc;
}


#define PROGRESS_BAR_WIDTH 50

int sam7dfu_do_dnload(struct usb_dev_handle *usb_handle, int interface,
		      int xfer_size, AbstractFile* file)
{
	int ret, bytes_sent = 0;
	unsigned int bytes_per_hash, hashes = 0;
	char *buf = malloc(xfer_size);
	size_t fileSize;
	struct dfu_status dst;

	if (!buf)
		return -ENOMEM;

	fileSize = file->getLength(file);
	if (fileSize <= 0 /* + DFU_HDR */) {
		fprintf(stderr, "File seems a bit too small...\n");
		ret = -EINVAL;
		goto out_close;	
	}

	int totalSend = fileSize + 16;
	char hash[] = {0xff, 0xff, 0xff, 0xff, 0xac, 0x05, 0x00, 0x01, 0x55, 0x46, 0x44, 0x10, 0x0, 0x0, 0x0, 0x0};
	uint32_t crc = 0xFFFFFFFF;
	int hashSent = 0;

	bytes_per_hash = fileSize / PROGRESS_BAR_WIDTH;
	if (bytes_per_hash == 0)
		bytes_per_hash = 1;
	printf("bytes_per_hash=%u, fileSize=%lu\n", bytes_per_hash, (unsigned long) fileSize);
#if 0
	read(fd, DFU_HDR);
#endif
	printf("Starting download: [");
	fflush(stdout);
	while (bytes_sent < totalSend /* - DFU_HDR */) {
		int hashes_todo;

		if(hashSent == 0) {
			ret = file->read(file, buf, xfer_size);
			if (ret < 0) {
				perror("read");
				goto out_close;
			}
			AppleCRC32Checksum(&crc, buf, ret);
		} else {
			ret = 0;
		}

		if(ret < xfer_size && hashSent == 0) {
			AppleCRC32Checksum(&crc, hash, 12);
			hash[12] = crc & 0xff;
			hash[13] = (crc >> 8) & 0xff;
			hash[14] = (crc >> 16) & 0xff;
			hash[15] = (crc >> 24) & 0xff;
		}

		if(ret < xfer_size) {
			int toSend = xfer_size - ret;
			if(toSend > (16 - hashSent))
				toSend = 16 - hashSent;

			memcpy(buf + ret, hash + hashSent, toSend);
			hashSent += toSend;
			ret += toSend;
		}

		ret = dfu_download(usb_handle, interface, ret, ret ? buf : NULL);
		if (ret < 0) {
			fprintf(stderr, "Error during download\n");
			goto out_close;
		}
		bytes_sent += ret;

		do {
			ret = dfu_get_status(usb_handle, interface, &dst);
			if (ret < 0) {
				fprintf(stderr, "Error during download get_status\n");
				goto out_close;
			}
			usleep(5000);
		} while (dst.bState != DFU_STATE_dfuDNLOAD_IDLE);
		if (dst.bStatus != DFU_STATUS_OK) {
			printf(" failed!\n");
			printf("state(%u) = %s, status(%u) = %s\n", dst.bState,
				dfu_state_to_string(dst.bState), dst.bStatus,
				dfu_status_to_string(dst.bStatus));
			ret = -1;
			goto out_close;
		}

		hashes_todo = (bytes_sent / bytes_per_hash) - hashes;
		hashes += hashes_todo;
		while (hashes_todo--)
			putchar('#');
		fflush(stdout);
	}

	/* send one zero sized download request to signalize end */
	ret = dfu_download(usb_handle, interface, 0, NULL);
	if (ret >= 0)
		ret = bytes_sent;
	
	printf("] finished!\n");
	fflush(stdout);

get_status:
	/* Transition to MANIFEST_SYNC state */
	ret = dfu_get_status(usb_handle, interface, &dst);
	if (ret < 0) {
		fprintf(stderr, "unable to read DFU status\n");
		goto out_close;
	}
	printf("state(%u) = %s, status(%u) = %s\n", dst.bState, 
		dfu_state_to_string(dst.bState), dst.bStatus,
		dfu_status_to_string(dst.bStatus));

	/* FIXME: deal correctly with ManifestationTolerant=0 / WillDetach bits */
	switch (dst.bState) {
	case STATE_DFU_IDLE:
	case STATE_DFU_MANIFEST_WAIT_RESET:

		break;

	default:
		sleep(1);
		goto get_status;
	}
#if 0
	printf("Resetting USB...\n");
	if (usb_reset(usb_handle) < 0) {
		fprintf(stderr, "error resetting after download: %s\n", 
			usb_strerror());
	}
#endif
	printf("Done!\n");
out_close:
	file->close(file);
	free(buf);

	return ret;
}

void sam7dfu_init()
{
    dfu_debug( debug );
    dfu_init( 5000 );
}


